Attachment for hydraulic jacks



Nov. l, 1938. G. A. coUNTRYMAN 13517-78 ATTACHMENT FOR HYDRAULIC JACKS Filed 0G11. 15, 1936 Patented Nov. 1, 1938 UNITED STATES PATENT OFFICE 3 Claims.

The invention relates to an attachment for hydraulic jacks for automobile repair work and more particularly to a clamping and spreading attachment for double acting hydraulic jacks.

'I'he object of the improvement is to provide an attachment for a double acting hydraulic jack whereby either a clamping or spreading action may be produced so that various portions of automobile frames and the like may be pushed or pulled into alignment, dents may be removed and the parts may be otherwise straightened.

A further object is to provide such an attachment including a pair of telescoping tubes, one of which is adapted to be connected to the cylinder and the other to the ram or piston of the jack, jaws or similar tools being connected to the telescoping tubes for producing either a clamping or spreading action, depending upon the operation of the double acting jack.

n Another object is to provide such an attachment in which one of the jaws or tools may be adjustably mounted upon the outer of the telescoping tubes so as to accommodate the attachment to various sizes of work.

g5 'Ihe above objects together with others which will be apparent from the drawing and following description, or which may be hereinafter referred to, may be attained by constructing the improved attachment in the manner illustrated 30 in the accompanying drawing, in which Figure 1 is a sectional elevation of a double acting hydraulic jack provided with the improved clamping and spreading attachment;

Fig. 2, a sectional elevation on a smaller scale,

35 showing the use of the attachment for straightening a dent or bend in a frame member Fig. 3, a detail perspective view of a special jaw or tool for use in an operation such as shown in Fig. 2; and

40 Fig. 4, an elevation showing the use of the attachment for spreading a front cross member or the like.

Similar numerals refer to similar parts throughout the drawing.

45 The attachment to which the invention pertains is adapted for use upon any hydraulic jack, particularly of the double acting type and is illustrated as applied to a double acting hydraulic jack such as disclosed in my Patent No. 1,985,151,

50 granted December 18, 1934.

This jack comprises generally the cylinder III and the pump II for operating the same, both ot which are shown as mounted upon a base I2, the ram or piston I3 being operable within the Il cylinder l0.

The attachment to which the invention pertains includes a pair of telescoping tubes I4 and Y I5, the tube I4 being externally threaded at one end as indicated at I6 for engagement with the internal screw threads Il within the collar I8 5 xed to the upper end oi the cylinder III.

'I'he inner tube I5 is internally threaded at one end for engagement with the threaded head I9 of the ram or piston I3 of the hydraulic jack and may be externally threaded at its other end as 10 at for attachment of a jaw or the like such as the toe clamp 2I provided with the internally threaded collar 22.

Although screw threads are shown for detachably connecting a jaw to the tube I5, it should 15 be understood that any suitable and well known means may be provided for detachably connecting a jaw to said tube. The toe clamp 2I may be provided with a bore 23 for the purpose of connecting an extension thereto, as will be later 20 described.

Any suitable jaw such as the toe clamp 24 may be detachably connected to the outei` end of the outer tube I4 and for the purpose of providing for the clamping or spreading of parts of various 25 sizes this toe clamp 24 may be adjustably mounted upon the tube I4.

This adjustment may be accomplished in various manners but for the purpose of illustration a series of spaced apertures or sockets 25 are 30 provided in the tube I4 and the collar 26 of the toe clamp 24 ls provided with a set screw 2l adapted to selectively enter any one of these sockets or apertures to hold the toe clamp 24 in adjusted position upon the tube I4.

It will be seen that as the hydraulic jack is operated to raise the ram I3, the tube I5 will be moved outward relative to the tube I4, thus separating the toe clamps 2I and 24, whereby the attachment may be used for spreading the work; while the operation of the jack in the other direction, to lower the ram I3, will operate to move the toe clamp 2l toward the toe clamp 24, whereby the attachment may be used for clamping, bending or any pulling operation.

An illustration of the use of the attachment,

equipped with the toe clamps 2i and 24, is shown in Fig. 4, in which the device is shown in use for spreading a bent front cross member A of an automobile frame.

This has always been one of the most diflicult operations in the straightening of an automobile frame but it has been found that with this attachment the operation is made quite simple and the cross member may be either spread, as shown in Fig. 4, or pulled together to the desired position.

In Fig. 2 is shown the use oi' the attachment for removing a dent from a bent channel frame. For this purpose the extension 2l may be attached to the toe clamp 2| by inserting the stem 2l 'oi' said extension through the bore 2l in the toe clamp, a nut 3l being provided for the outer threaded end oi' the stem in order to secure the extension upon the toe clamp.

For this purpose the toe clamp 24 may be removed from the outer tube Il and the bending toe clamp 3l may be substituted therefor. This toe clamp ll is provided with the collar I! which tits upon the tube I 4 in the same manner as the collar 26 of the toe clamp 2l, a set screw 2l being`- provided in said collar for engagement in any of the apertures or sockets 25 of the tube.

A pair of spaced lugs 3l are formed upon the bending toe clamp ll for contact with the rear face of the channel frame B. at opposite sides of the dent D to be removed therefrom while the extension 2l oi' the toe clamp 2| contacts with said dent as shown in Fig. 2. By operating the jack to lower the ram, it will be seen that the toe clamps will be pulled toward each other, the extension 2l pressing the dented portion of the channel frame back into the normal position.

Although only two uses of the attachment are illustrated and described. it should be' understood that any spreading or clamping operation for bending or straightening of automobile frames and the like may be easily accomplished with this attachment and various sizes and shapes of toe clamps may be provided for accomplishing the various operations.

I claim:

1. An attachment for a hydraulic jack including a cylinder and a ram each having a threaded end, said attachment comprising a tube threaded at one end and connected to the threaded end of the cylinder, a tube threaded at one end and telescoped within the tirst named tube and connected to the threaded end of the ram, and laterally projecting jaws upon said tubes. one oisaid laws being adjustably mounted upon the rst named tube.

2. An attachment for a hydraulic jack including a cylinder having internal threads at its upper end and a ram having external threads at its upper end, said attachment comprising a tube having external threads at one end connected to the internal threads of the cylinder, a second tube telescoped within the first named tube and having internal threads at one end connected to the external threads of the ram, and external threads at its other end, a laterally projectlng Iiaw having internal threads connected to the external threads of said last named tube, and a laterally projecting jaw adjustably mounted upon the first named tube.

3. An attachment for a hydraulic Jack including a cylinder having internal threads at its upper end and a ram having external threads at its upper end, said attachment comprising a tube having external threads at one end con- GUY A. COUNTRYMAN. 

